Toronto - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 5:00 PM EDT Thursday 4 June 2026

4Moderate Risk




1
2
3
4
5
6
7
8
9
10
+

Low Risk
(1-3)

Moderate Risk
(4-6)

High Risk
(7-10)

Very High Risk



At-Risk Population:

General Population:

  • No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.

Forecast Maximums

Issued at: 5:00 PM EDT Thursday 4 June 2026

Thursday night

5 - Moderate Risk

Friday

5 - Moderate Risk

Friday night

5 - Moderate Risk

Saturday

3 - Low Risk

Who is at risk?

People with heart and lung conditions are most affected by air pollution.

To find out if you are at risk, consult the health guide, your physician, or your local health authority.

Visit the national AQHI Web site to learn more about the AQHI.

Did you know...?

Even modest increases in air pollution can cause small but measurable increases in the use of medication, emergency room visits, hospital admissions and premature death.


The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.

AQHIScale

Observed ConditionsFootnote †


4 - Moderate Risk

Calculated at:

5:00 PM EDT Thursday 4 June 2026

 

Forecast Maximums


Thursday night
5 - Moderate Risk



Friday
5 - Moderate Risk



Friday night
5 - Moderate Risk



Saturday
3 - Low Risk




Issued at:

5:00 PM EDT Thursday 4 June 2026

 

The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.

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